CVE-2026-66065
- Source
- https://cve.org/CVERecord?id=CVE-2026-66065
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66065.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-66065
- Aliases
- Published
- 2026-08-03T20:20:27.599Z
- Modified
- 2026-08-06T03:31:19.096242523Z
- Severity
-
- 8.4 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Ouroboros: Untrusted project .env can still reach RCE via omitted execution-routing keys (Incomplete fix of CVE-2026-47211)
- Details
-
Ouroboros is a local-first runtime for AI coding agents that records their actions and applies user-defined policies to constrain behavior. Versions prior to 0.42.1 have an incomplete denylist. Several execution-routing keys of the same RCE class were omitted, so a malicious cloned repo can still reach arbitrary command execution by shipping a .env (auto-loaded at import, with no review step). The CVE-2026-47211 fix added UNTRUSTEDENV_DENYLIST to stop an untrusted project-directory .env from redirecting execution, but it did not account for all keys. The backend config-home and MCP/plugin roots bypass the approval gate by pointing the nested agent, MCP servers, and plugin roster at attacker config. Other variables re-enable blocked local transports, replace sub-agent prompts, switch backends, and lower tool approval classes, further weakening the approval gate. This issue has been fixed in version 0.42.1.
- Database specific
{ "cwe_ids": [ "CWE-15", "CWE-94" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66065.json", "cna_assigner": "GitHub_M" }- References